6
Q:

 If a2 = 12, then a4 =? 

 

A) 144 B) 72
C) 36 D) 24

Answer:   A) 144



Explanation:

Given a x a = 12

asked to find a x a x a x a =  (a x a) x (a x a)

a4 = a2 x a2 

= 12 x 12

= 144.

 

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